Portable grindstone.



(Ilo Model.)

C. H. FERGUSON. PoRTABLE GmnnsToNE.

Application led Dec. 18. 1900.)

Patented Sept. 3, |90I.

2 Sheets-Sheet I.

Patented Sept. 3, |90I.

No. ss|,a79.

C. H.`FEHGUSON.

PDBTABLE GRINDSTUNE.

(Appumon med nec. 1s, 1900.) No Model.) 2 Sheets-Sheet 2.

g, gm

UNITED STATES PATENT OEEIcE.

CHARLES H. FERGUSON, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO THEWILCOX MANUFACTURING COMPANY, OF AURORA, ILLINOIS.

PORTABLE GRINDSTONE.

SPECIFICATION forming part of Letters Patent No. 681,879, datedSeptember 3, 19.01.

Application filed December 13, 1900. Serial No. 39,782. (No model.)

"To a/ZZ whom t may concern:

Be it known that I, CHAELEs H. FERGUSON,

.and more especially to certain features of construction in a foldableo-r collapsible frame therefor whereby an increased rigidity of thestructure as a whole is obtained, together with greater ease ofoperation.

More specifically, my invention contemplates improvements in, first, thetreadle mechanism for operating the stone secondly,

an improved mode of bracing the frame whereby an increased stability ofthe structure as a whole is obtained; thirdly, an improved means foradjusting the water-guard to and over the periphery of the stone;fOurthly, an improved method of mounting the axle-bearing blocks on theframe, and, finally', an improved ball-bearing for the journals of theaxle.

My invention is illustrated in the accom panying drawings, inwhichvFigure 1 is'an elevation in perspective of a grindstone and frameset up in working position. Fig. 2 is a transverse sectional View of thegrindstone, showing the manner of securing the axle or shaft therein andalso illustrating in section one of the journal-bearings of-said shaft.Fig. 3 is a detail in vertical section of the said shaft-bearing atright angles to the view of the same shown in Fig. 2,

'and Fig. 4 is a detail illustrating the manner of mountingthewater-guard.

Referring to the drawings in detail, l represents a pair ofhorizontally-disposed iron bars between which the stone 2 is journaledin the manner hereinafter explained. To the forward ends of these bars 1are pivoted at 3 two legs 4, which support the forward end of the frameand its load. Approximately twothirds of the distance from their forwardends the bars 1 are bent inwardly toward each other, as at 5, and totheir rearwardly-extending portion is secured a saddle 6 by means of ascrew-bolt 7, engaging a clip 8 on jor shaft of the stone.

in rear of the inwardly-curved parts of the V bars 1 are pivoted, as at9, a pair of rearwardly-extending vertical supports or legs 10.

All four of the vertical supports or legs are given a slight lateral andlongitudinal straddle, whereby the base area, and consequently thestability of the structure, is increased. The forward legs 4 aresuitably braced by diagonal braces 11, and the rear legs 10 are rigidlysecured at their lower ends by a transverse brace 12. the horizontalbars 1 are supported bearingblocks 13, in which is journaled the shaft14 of the grindstone. In order to make these bearing-blocks readilyremovable, they are notched on their lower edges, as at 15, whereby theymay be readily slipped down over a pair of screw-bolts 3 and 16, bywhich they are readily clamped to the bars 1. The upper part of eachbearing-block 13 constitutes the seat for the journal-bearingof the axleIn the construction of said bearing the transverse hole through whichthe shaft passes is channeled out centrally thereof, as at 17, to form arace in which the balls may run, andv that part of the surface of theshaft which registers with the said race 17 is also hollowed orchanneled, as at 18,to engage the inner faces of the balls constitutingthe antifriction-bearing. Through the top of the bearing-block is formeda hole 19, leading into the ball-race 17 and through which the balls maybe dropped one at a time until the bearing has been supplied with therequisite number, after which the hole may be stopped by a suitable corkor plug 20. In addition to the foregoing the hole 19 forms a convenientmeans whereby the bearing may be oiled when desired.

Another advantage of the above-described construction of bearing residesin the fact that it automatically determines the exact position of theshaft and guards the same against endwise thrust or displacementwitliout the necessity of any additional guides or guards.

The stone may be secured to the shaft 14 in a simple and efficientmanner as follows: p

A hole of a diameter somewhat exceeding the Upon the forward ends of Athe frame.

diameter of the shaft is formed centrally through vthe stone, and theshaft 14, having rigidly secured thereon a square nut 2l and a collar22, is passed therethrough in such a manner that the axis of the shaftwill coincide with the axis of the stone. The space between the surfaceof the shaft and the inner surface of the hole is then iilled withcement or similar material, and the collar 23, which engages the outerscrew-threaded end of the shaft, is turned up hard against the stone,thus securely clamping the shaft 14 rigidly in true central relation tothe stone.

Referring next to the mechanism for operating the stone,24 designates apair of treadles which are pivoted at their forward ends on a rod 25,extending transversely across and between the lower ends of the forwardlegs4 of Each of these treadles is simply land cheaply constructed outof a single length of strap metal, preferably iron, bent into the formplainly shown in Fig. l, the closed end of the treadle constituting thepedal and the open end being pivoted on the rod 25, as above described.The treadles are connected to the crank-arms 26 on the ends of the shaft14 by means of the pitman-rods 27, the upper ends of which may be simplybent over, so as to hook on the hanged crank-pins 28 in a manner whichenables them to be readily removed -from engagement with said crank-pinswhen desired. The rods 27 are at their lower ends connected to thetreadles 24 at a point between the ends of the latter, thus constitutingsaid treadles levers of the second class.

29 and 30 designate a pair of oppositelydisposed diagonal braces ortie-bars applied to each side of the frame structure. The braces 29 arepivoted at their upper ends on a pivot-bolt 9 and at their lower endsare removably secured by screw-bolts 31 to the legs 4, while theoppositely-disposed braces 30 are pivoted at their upper ends to thescrew-bolts 16 and at their lower ends are removably secured to the rearlegs 10 by means of a bolt 32, extending between said legs and through atransverse brace 33, as shown. Between horizontal bars 1 and justin rearof the curved parts 5 of said bars is adjustably clamped a water-guard34, the heel of said guard being engaged by the pivot-bolt 9 and forminga pacing-block between the upper ends of the ess 10.

From the foregoing construction it will be seen that the side braces 29,the horizontal bars l, the rear legs 10, and the heel of the water-guard34 are all clamped together by the single pivot-bolt 9, and by slightlyloosening the latter the water-guard 34 may be adjusted toward the stoneas required by the wearing away of the periphery of the latter.

35 is a transverse brace disposed between the lower ends of the frontlegs 4 and conveniently secured by the treadle pivot-bolt 25p A standard36, secured at its lower end to the frame structure, as by the screw 3,supports at its upper end a can 37 for containing water the flow ofwhich onto the stone may be regulated by a cock and faucet 38.

Referring to the collapsible and portable character of my invention, itis noted that by slightly loosening the screw-bolts 3, 16, and 9 andwithdrawing screw-bolts 3l and 32 and detachin g the pitman-rods 27 fromtheir crankpins 28 the stone, with its'shaft and bearings, maybe liftedout of the frame, the side braces, treadles, standard, and pitman -rodsswung alongside the front and rear supports 4 and 10, and the front andrear portions of the frame may then be folded together in small andcompact compass for shipment or storage. This construction forms a verysubstantial and rigid support for the stone when in use, and by reasonof the fact that the various parts of the frame can be made fromcommercial forms of strap or bar iron simply cut and bent in therequired lengths and shapes and secured together by screws and bolts itis obvious that such a frame as I have described can be produced at alow cost of manufacture.

I claim as my invention- 1. In a portable grindstone, the combination,with the stone and its shaft and a suit-vr able supporting-frametherefor having a seat for the operator thereon, of a pair of treadleseach formed from a single length of strap metal bent into appropriateshape and pivoted at its open end to the lower forward end of the frame,the closed end of the treadle constituting the pedal, and suitablepitman-rod conneotions between said treadles and the cranks of theshaft, substantially as described.

2. In a portable grindstone, the combination with the stone and itsshaft and a suitable supporting-frame therefor of a pair of treadles,each formed from a single length of strap metal doubled upon itself andpivoted at its open end to the lower forward end of the frame, theclosed end of the treadle constituting the pedal and being disposed atright angles to the body portion thereof, and suitable pitman -rodconnections between said treadles and the cranks of the shaft,substantially as described. f

3. In a portable grindstone, a collapsible supporting-frame thereforcomprising a pair ofy horizontal bars carrying the shaft-bearing blocksat one end and the operators seat at the other, front and rearsupporting-legs pivoted at their upper ends to said .horizontal bars,suitable braces between the front and rear legs of the framerespectively, and a pair of oppositely-disposed diagonal braces pivotedat their upper ends to the horizontal bars and removably secured attheir lower ends to the front and rear legs on each side of the frame,all united and combined, substantially as described.

4. In a portable grindstone, the combination with the stone and itsshaft, of a suitable supporting-frame therefor, and a wa ter-guardpivotally clamped through its heel between the upper horizontal membersof the sup- IOO IIO

porting-frame and adjustable toward and away from the stone by looseningits pivot-l 'in the bearing-blocks, whereby the latter may be securelyclamped to the horizontal members of the frame and maybe readily removedtherefrom by loosening said bolts, substantially as described.

6. The combination, in a grindstOne-frame, of the horizontal andsupporting members Of the frame suitably pivoted together, a pair ofOppositelydisposed diagonal braces on each side of the frame pivoted attheir upper ends to the horizontal member and secured at their lowerends to the front and rear supporting members,and a pair ofbearing-blocks having notches cut in their lower edges to engage andrest upon the screwbolts which unite Ithe upper ends of the forwardsupport# ing member and one Of the diagonal braces On each side to thehorizontal member Of the frame, and to be removably clamped between saidparts, whereby, by loosening said screwbolts said bearings may bereadily lifted out of place, substantially as described. l

CHARLES H. FERGUSON.

l/Vitnesses:

SAMUEL N. POND, FREDERICK C. GOODWIN.

